Chapter 10: Real-Time Statistics; Overview Of Real-Time Statistics - Extreme Networks EPICenter Reference Manual

10 Real-Time Statistics
This chapter describes how to use the Real-Time Statistics applet for:
Viewing percentage utilization or total errors data for multiple ports in an Extreme Networks switch,
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a switch slot, or a port group.
Viewing historical utilization, total errors, or individual errors data for a specific port on an Extreme
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Networks switch.

Overview of Real-Time Statistics

The Real-Time Statistics feature of the EPICenter software enables you to view a graphical presentation
of utilization and error statistics for Extreme Networks switches in real time. The data is taken from
Management Information Base (MIB) objects in the etherHistory table of the Remote Monitoring
(RMON) MIB. The Real-Time Statistics function is supported only for Extreme Networks switches.
NOTE
You must have RMON enabled on the switch in order to collect real-time statistics for the switch. You can enable
RMON for a switch using the "enable rmon" CLI command.
You can view data for multiple ports on a device, device slot, or within a port group, and optionally
limit the display to the "top N" ports (where N is a number you can configure). If you choose to view
multiple ports, the display shows data for the most recent sampling interval for the selected set of ports.
The display is updated every sampling interval.
You can also view historical statistics for a single port. If you choose to view a single port, the display
shows the value of the selected variable(s) over time, based on the number of datapoints the MIB
maintains in the etherHistory table.
You can choose from a variety of styles of charts and graphs as well as a tabular display.
You can view the following types of data:
Percent Utilization
Total Errors
Individual Errors
Error Variables
EPICenter Reference Guide
The percent of utilization for each port in the set (device, port group, or single
port). This percent reports the value of the etherHistoryUtilization MIB object.
The MIB defines this variable as the best estimate of the mean physical layer
network utilization on this interface during this sampling interval, graphed in
percents.
Total number or errors for each port in the set (device, port group, or single
port). Total Errors is the sum of the six error variables shown below.
The number of individual errors for a single port. An individual errors display
shows the six error variables shown below.
RMON etherHistory error variables for port error displays.
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